I have been with DreamHost for over 2 years, and I must say that the outages you have been experiencing over the last couple of weeks are very unusual indeed. The track record during this period is not a fair indication of the normal level of service. The six-hour outage you experienced was a result of the extreme heat experienced on the west coast (it knocked out the entire datacenter, and even resulted in the loss of MySpace for a few hours).
That being said, I totally understand your frustration. The level of service failure has been without precedent.
One thing I must say in DreamHost's favor is this: DreamHost has been extraordinarily forthcoming with information. http://dreamhoststatus.com/ has been continuously updated throughout the difficulties. Most hosting companies prefer to keep this sort of detail to themselves.
Simon Jessey | Keystone Websites
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